Housing minister Yvette Cooper warns politicians cannot ignore the need to build more houses to contain prohibitive house price growth. She says the government is committed to protecting the green belt, but local interest groups and politicians must drop their opposition to sustainable new communities.

Liberal Democrat communities and local government spokesman Andrew Stunell calls on the government to make housing truly affordable. Gordon Brown must focus on social rented housing as much as home-ownership, he warns, or risk a rise in repossessions and homelessness.

The secretary of state David Miliband launched the draft climate change bill with the insistence there is no longer any debate that climate change is a reality and emissions are to blame. Working from this assumption, the climate change bill commits the UK to reducing emissions, based on a new system of carbon budgets and enforced by a climate change committee

The Liberal Democrat environment minister Chris Huhne outlines the Lib Dem's concerns with the climate change bill in its current form. Although welcoming it as a starting point to curb emissions, Mr Huhne warns the bill is weakened by a lack of yearly targets and is vulnerable to political interference - allowing governments to avoid responsibility for missed targets.

The secretary of state for transport Douglas Alexander explains where the government stands so far on road pricing, ahead of local government pilot schemes. With congestion set to increase by 25 per cent by 2015, he warns doing nothing is not an option.

The shadow transport Chris Grayling argues the government is out of touch over the "pie in the sky" national road pricing scheme. He argues the 1.8 million people who signed an anti-road pricing petition were right to oppose an unrealistic scheme that should not be forced on local authorities.

The Liberal Democrat transport spokesman Alistair Carmichael calls on drivers to ignore the "myths" surrounding road pricing. The facts include rising congestion and a rising threat to the economy and environment and maintain the status quo is no longer feasible.

The environment minister Ian Pearson explains why the government is working towards a code of best practice on carbon offsetting and why it believes offsetting can be an effective part of a realistic strategy to combat climate change.

The Green Party's principal speaker Dr Derek Wall highlights the shortcomings of carbon offsetting, concluding it can have only a very limited role in the fight against climate change. He argues any system will need to be regulated by strong legislation to ensure companies do offset carbon emissions as promised.

Liberal Democrat environment spokesman Chris Huhne says carbon offsetting must be more than just a fashion statement if it is to have a real positive effect on climate change. He argues the long-term objective must be to reduce carbon emissions.

Liberal Democrat trade and industry spokeswoman Susan Kramer said the government has clearly had a role in the decline of the Post Office network, despite blaming the way people choose to live their lives.